Safety device for machines.



G. HEAR. i SAFETY DEVICE FOR MAGHINES.

APPLIQATION FILED AUG. 8. 1913.

1,1 1 6,061 I Patented Nov. 3, 1914 2 SHEETS-SHBET 1.

WEE/2145565: I I22 wena QQ G. HBAP.

SAFETY DEVICE FOR MACHINES.

APPLICATION FILED AUG. 8 1913.'

' Patented N 0v. 3, 1914.

h 2 SHEETS-SHEET 2.

w'izzasse [5276226 021 GEORGE nnAr, or

CLEVELAND, OHIO.

SAFETY DEVICE FOR MACHINES.

iiiaoei.

Application filed August 8, 191-3. Serial No. 733,727.

Specification of Letters Patent.

Patented Nov. 3, 1914.

To all LU/1017b it may concern Be it known that I, Gannon HEAP, asubject of the King of Great Britain and Ireland, residing at Cleveland,in the county of Cuyahoga and State of Ohio, have invented a certain newand useful Improvement in Safety Devices for Machines, of which thefollowing is a full, clear, and exact desciiption, reference being hadto the accompanying drawings.

This invention is for a safety device to be used in .connection withmachines which are dangerous to the hands of the operator because thearticle to be acted upon must be held by the hands near to mechanism inwhich they are liable to be injured;

The principal object is to prevent running the machine while theoperators hands are too near the danger zone. This is accomplis'hed byproviding a pair of'latches which prevent the shifting of a clutch intodriving position, except when each hand is resting on controllingmechanism, insuring them being out of the danger zone when'the machineis started.

. As shown in the accompanying drawings, my device is applied to a pressfor setting the 'ends on pasteboard boxes.

This invention is hereinafter more fully described and the essentialcharacteristics are set fort-h in the claims.

In thedrawings, Figure 1 is a front eleva-' tion of an end settingmachine showing my device as applied thereto; Fig. 2 is a side elevationof the same; Fig. 3 is a plan of the lever mechanism for operating theclutch with the foot; Fig. 4 is a sectional detail of the mechanism forholding the hand operating lever, being a section taken on the line 44of Fig. 1.

The side members ofthe press shown are designated 5 and 6 and aremounted upon a base 7 and support a cross member 8 extending across thetop-of the press and forming an abutment for the head 9 of the ram 10.This ram 10 is adapted to be-raised by mech anism, not shown, when theshaft 12 is rotated by the engagement of aclutch member 14 withtheclutch member 15, rigid with a driving pulley 16. The cross head 8 isshown as yieldingly held to the frame members 5 and 6 by means ofsprings 18 surrounding suit able studs and adjustably compressed bymeans of nuts 19 threaded onto the studs. This is to prevent thebreaking of any of the operating parts when too great a thickness comesbetween the cross head S'and the head 9. I

The clutch member 14 in the press shown is adapted to be shiftedby abifurcated arm of a bell crank 20 pivoted at :21, having its other leg22 engaging an arm of a foot lever 24 pivoted at 25 to the base 7 of themachine. lVhen the foot lever 24 is depressed, the arm 22 is raised andthe other leg of the bell crank moves the clutch member 14 intoengagement with the clutch member 15, thus starting the machine.

The foregoing is a brief description of a press with which my device maybe used, but it is to be understood that the same is simply illustrativeof any suitable power invention will now be fully described. Rigidlysecured to the membersQG forming a bifurcated portion of the bell crankder 29 are two latches 30 and 31 pivoted 32 to a suitable bracket 33carried on the side member 6 of the machine. These latches are in theform of hooks, so shaped that either of them will prevent the movementof the clutch member 14 by reason of their engagement with the shoulder29, except when both are raised. To allow the shoulder to pass freelyunder the books on the return movement of the clutch member, the r arebeveled, as at 34, to. present a cam. sur face to the shoulder. Thereturn of this clutch member is caused by the action of a tension spring35 secured to the frame member 6 and to the bell crank member 20.

Suitably journaled in bearings 3,6 mounted on the sides of the framemembers and 6 are rock shafts 37 and 38. The rock shaft 38 has a rigidrock arm 40. to which is tached a chain 41 leading downw rdly to thebook 30 to which it is suitably attached. A similar rock arm 43 isrigidly mounted on the rock shaft 37 and is connected by a chain 44 tothe other hook 01. the chain passing intermediately over a pulley 45loose on the shaft 38. It results from this cor struction, that, whenthe rock shaft is out of engagement with the shoulder 29, and, when therock arm 48 is moved outwardly, by the rotation of the rock shaft 38,the other latch will be raised out of engagement with the shoulder 29 bymeans machine. The attachment constituting my 20 is a yoke 28 havingthereon a transverse shoulder 29. Normally engaging this snout-- turnedto move the arm. 4.0 upwardly, the latch connected to the chain 41.willbe raised of the chain st. In order to rock these rock shafts toraise the hooks and 31, and allow the clutch member to'be thrown intoaction only when the operators hands are out of danger, I provide leversi8 rigidly carried on the forward end .of these rock shafts 37 and 38.These levers extend to-- ward the center of the machine adjacent thehead 9 of the ram 10. but enough below it, so that when the wrists orhands of the operator are depressing them by resting upon them, thehands will be entirely out of danger of getting between the head 9 andthe cross head 8, where they could be crushed. The inner ends of theselevers d8 are preferably provided with suitable pads 19 to preventdiscomfort when the hands are resting on them. Each lever 48 isadjustably carried by a block 50 rigidly secured to the end of therespective rock shaft 3'7 or 38 and clamped thereon by means of aneyebolt 51, through which the lever 48 passes. These eye-bolts, asshown, pass through the blocks 50 and act todraw the lever-s 4:8 downagainst suitable ledges 53 under the influence of a thumb nut This is toprovide for lateral adjustment of these levers to aecommodate differentsized pieces of work In the operation of this machine, a portion of abox, indicated by broken lines at 56, is

held by the operator around the head 9, and an end or other portion ofthe box is moved between the head 9 and the head 8. This latter portionof the box having glue on its edges, is secured to the other portion ofthe box by the upward pressure of the head 9. Now, it will be seen thatthe operators hands are down at the sides of the box portion being heldby the hand, that the wrist may depress the levers 48 by being in theposition shown in Fig.2. Thus the hooks controlling the movable clutchmember may be raised only when. both of these members are depressed,insuring both hands being in a safe position.

Having thus described by invention, what I claim is:

l. The combination with mechanism liable to injure the hands of theoperator, of devices located adjacent said inechanisnr and adapted tocontrol the starting thereof, said devices being adapted to be engagedbyportions of the operators arms while he is per-' forminghis regular workon the machine and permitting the starting only when his hands are insafety position.

The combination, with mechanism liable to injure the operators hands, ofa foot controlled clutch, a latch for preventing the movement of saidclutch, and means eontrolling said latch located a safe distance awayfrom the dangerous mechanism and adapted to be moved by the operatorswrists when the hands are in working position to permit the movement ofsaid clutch and starting of the mechanism.

3. The combination, with a machine liable to injure the operator, of apair of rock shafts, means operated thereby for preventing the operationof the machine, and a pair of rods adjustably mounted on the rock shaftsand projecting into the' position for .engagementibythe wrists of theoperator while his hands are working but in safety position. v

4. The combination, with a press having a movable head and an abutmentblock, of means for moving said movable head, a clutch for controllingsaid means, latches for preventing the operation of the clutch, deviceslocated adjacent to the movable head adapted to control said latches,connections between the latches and said devices, said devices beingmovable by'the operator while holding a blank to be operated upon topermit the movement of the clutch only when the operators members are insafety position.

5. The combination, witha press having an abutment block and a movablehead, of

means for controlling the-movable head comprising a slidable clutchoperated by a foot lever, latches controlling the movement of saidclutch, rock shafts carried by the press, rock arms on the rock shafts,flexible connections between said latches and said rock shafts, andlevers carried by the rock shaft extending to a point adjacent themovable head, whereby the rock shafts may be moved to release the clutchwhen the operators hands are in safe position.

6. The combination, with a press having an abutment-block and a movablehead, of means for controlling the movable head comprising a slidableclutch operated by a foot lever, latches controlling the movement ofsaid clutch, rock shafts carried by the press,

connections between said latches and said rock shafts, and rodsadjustably mounted in clamps carried by the rock shafts and eX- tendingto points adjacent the movable head on each side thereof, whereby therock shafts may 'be moved to release the clutch by the operator s'forearms while his hands are at work, provided his hands are in asafeposition.

In testimony whereof, I hereunto aiiix my signature in the presence oftwo witnesses. GEORGE HEAR Witnesses:

ALBERT H. Barns, BRENNAN B. VVEs'r.

